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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '289dccc808c15499d182821ff884778fe86ee3dd2dbc6309d25cdb408edc5691' 
  AND token = 'V+Rn8KKA6SlZaVx+SUCDqSq7XkZIzzxV0SiJP0sxw2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}